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colelawrence/promise-once-lazy.ts

Created July 3, 2020 13:16
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promise-once-lazy.ts
/** Lazy promise fetch will reuse promise if one was already created */
export function lazy<F extends () => Promise<any>>(f: F): F {
let once: ReturnType<F> | undefined
// @ts-ignore
return function () {
// @ts-ignore
if (once === undefined) once = f.apply(this, arguments)
return once
}
}
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